log (2x) + log (3y) - log (2z) 어떻게 간추려?log3(x^2-2x-6)=2 log(3x+6)=1+log(x)해결.

log (2x) + log (3y) - log (2z) 어떻게 간추려?log3(x^2-2x-6)=2 log(3x+6)=1+log(x)해결.

log(2x)+log(3y)-log(2z)=log(12xyz)
log3(x^2-2x-6)=2=log3(9) x^2-2x-6=9 x=-3 x=5 x=5로 x^2-2x-6